Mysterious oil consumption

So about 3000 miles ago I changed the oil. I put the correct amount of oil in (4.25 qts, cause I use a slightly taller filter). When I checked the oil today it was on the very bottom of the dipstick. Once I'd changed it I only got 3 qts back out. I can only see the typical leaks, little around the valve cover, etc. Nothing that would be a quart. No blue smoke out the back, even if I whomp the throttle. Any thoughts on where my oil is disappearing?

The oil filter can soak up quite a bit of oil. However, a quart seems a bit excessive. Where was the level on the dipstick right after you changed it? If I remember correctly, the difference between the low and high point on the dipstick is 1 quart.